A novel mechanism for macrophage pyroptosis in rheumatoid arthritis induced by Pol β deficiency.

A novel mechanism for macrophage pyroptosis in rheumatoid arthritis induced by Pol β deficiency.
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Pol β 缺乏引起的类风湿性关节炎巨噬细胞焦亡的新机制

DOI:
10.1038/s41419-022-05047-6
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发表时间:
2022-07-06
影响因子:
9
通讯作者:
Guo, Zhigang
Guo, Zhigang
中科院分区:
生物学1区
文献类型:
--
作者:
Gu, Lili;Sun, Yuling;Wu, Ting;Chen, Ge;Tang, Xiaojun;Zhao, Lianfeng;He, Lingfeng;Hu, Zhigang;Sun, Lingyun;Pan, Feiyan;Yin, Zhimin;Guo, Zhigang

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类风湿关节炎(RA)是一种慢性炎症性自身免疫性疾病。巨噬细胞下垂是一种细胞死亡的前炎性形式,在类风湿关节炎中非常重要;然而,引起下垂的详细机制尚不清楚。在此,我们报道了DNA聚合酶β(POLβ),它是碱基切除修复的关键酶,在类风湿关节炎的发病机制中起着关键作用。我们的数据显示,活动期RA患者和胶原诱导性关节炎(CIA)小鼠的外周血单个核细胞(PBMC)中POLβ的表达显著降低,并且在CIA小鼠模型中,POLβ缺乏增加了RA、巨噬细胞浸润和骨破坏的发生率。体外实验表明,Polβ缺乏可加重脂多糖加三磷酸腺苷诱导的巨噬细胞松弛,而过表达Polβ则抑制巨噬细胞松弛。进一步研究表明,POLβ基因敲除导致DNA损伤积累和胞浆双链DNA泄漏,激活了cGAS-STING-NF-κB信号通路,上调了NLRP3、IL-1β和IL-18的表达。综上所述,我们的研究结果阐明了POLβ在RA发展过程中的影响,并为STING-NF-κB途径诱导巨噬细胞松弛提供了详细的解释。
Rheumatoid arthritis (RA) is a chronic and inflammatory autoimmune disease. Macrophage pyroptosis, a proinflammatory form of cell death, is critically important in RA; however, the detailed mechanism underlying pyroptosis induction is not yet well understood. Here, we report that DNA polymerase β (Pol β), a key enzyme in base excision repair, plays a pivotal role in RA pathogenesis. Our data shows that Pol β expression is significantly decreased in peripheral blood mononuclear cells (PBMCs) from active RA patients and collagen-induced arthritis (CIA) mice, and Pol β deficiency increases the incidence of RA, macrophage infiltration, and bone destruction in CIA mouse models. In vitro, experiments showed that Pol β deficiency exacerbated macrophage pyroptosis induced by LPS plus ATP, while overexpression of Pol β inhibited macrophage pyroptosis. Further characterization revealed that Pol β knockout resulted in DNA damage accumulation and cytosolic dsDNA leakage, which activated the cGAS-STING-NF-κB signaling pathway and upregulated the expression of NLRP3, IL-1 β, and IL-18. In conclusion, our findings clarify the influence of Pol β on the development of RA and provide a detailed explanation for the STING-NF-κB pathway to induce macrophage pyroptosis.
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